The length of a rod is measured by four diffrent instruments and the measurements are reported as A. 500.0 mm, B. 50.0 cm, C. 0.500 m, D. 5.0*10-4 km.
we can conclude that
1) A is most accurate measurement
2) C is most accurate measurement
3) A,C,B are equally accurate measurements
4) The accuracy of all the measurements is the same

Answer length measured by A =500.0mm =500×10-3m                                        = 50 cm length measured by B =50 cm length measured by C = 0.500m = 50 cm length measured by D = 5×10-4km                                        = 50 cmsince four diffrent instryments measures the same length therefore option 4 is the right answer the accuracy of all the instrument is same .

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